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在FPGA中不支持 always @(posedge clk or negedge clk) is not accepted as a legal sensitivity list.想要实现双边沿触发其实很简单,只要两个always块就行always @(posedge clk)和always @(negedge clk)
always @(posedge clk or negedge clk)
always @(posedge clk)
always @(negedge clk)